| Revista: | Brazilian journal of chemical engineering |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000308891 |
| ISSN: | 0104-6632 |
| Autors: | Pereira, E.B1 Zanin, G.M Castro, H.F2 |
| Institucions: | 1Universidade Estadual de Maringa, Departamento de Engenharia Quimica, Maringa, Parana. Brasil 2Faculdade de Engenharia Quimica de Lorena, Departamento de Engenharia Quimica, Lorena, Sao Paulo. Brasil |
| Any: | 2003 |
| Període: | Dic |
| Volum: | 20 |
| Número: | 4 |
| Paginació: | 343-355 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental, aplicado |
| Resumen en inglés | The objective of this study was to evaluate the immobilization of lipase on a chitosan support by physical adsorption, aiming at its application in hydrolytic and synthetic reactions. Two types of chitosan (flakes and porous) were used for immobilizing lipase from a microbial source (Candida rugosa) and animal cells (porcine pancreas). The best results for recovery of total activity after immobilization were obtained for microbial lipase and porous chitosan beads. This set was selected for further immobilization studies, including full characterization of the immobilized derivative in aqueous and organic media. In aqueous medium, the operational and thermal stabilities of this preparation were quantified. In organic medium, the direct synthesis of n-butyl butyrate in organic solvent was chosen as a model reaction. The influence of several parameters, such as temperature, initial butyric acid concentration and amount of enzyme in the reaction system, was analyzed. Production of n-butyl butyrate was optimized and an ester yield response equation was obtained, making it possible to predict ester yields from known values of the three main factors. Use of this immobilized preparation was extended to the direct esterification of a large range of carboxylic acids (from C2 to C12) with a variety of alcohols (from C2 to C10) |
| Disciplines | Química |
| Paraules clau: | Ingeniería química, Biotecnología, Enzimas inmovilizadas, Lipasas, Esterificación, Hidrólisis |
| Keyword: | Chemistry, Chemical engineering, Biotechnology, Immobilized enzymes, Lipases, Esterification, Hydrolysis |
| Text complet: | Texto completo (Ver HTML) |
